Drift is a Bad Thing for SPICE Circuit Simulators

Drift is a Bad Thing for SPICE Circuit Simulators
by Daniel Payne on 10-07-2016 at 12:00 pm

My first job out of college was with Intel, located in Aloha, Oregon and I did circuit simulations using a proprietary SPICE circuit simulator called ASPEC that was maintained in-house. While doing some circuit simulations one day I noticed that an internal node in one of my circuits was gradually getting higher and higher, even… Read More


Why is Low Frequency Noise Measurement for ICs Such a Big Deal?

Why is Low Frequency Noise Measurement for ICs Such a Big Deal?
by Daniel Payne on 09-27-2016 at 12:00 pm

Even digital designers need to be aware of how noise impacts their circuits because most clocked designs today use a Phase Locked Loop (PLL) block which contains a circuit called a Voltage Controlled Oscillator (VCO) that is quite sensitive in operation to the effects of noise and process variation. As process node scaling continues… Read More


RTL Design Restructuring Explained

RTL Design Restructuring Explained
by Daniel Payne on 09-22-2016 at 4:00 pm

Modern SoC designs can use billions of transistors where transistors are grouped into gates, then gates grouped into cells, then cells grouped into blocks, blocks grouped into modules, and so on, creating a complex hierarchy. What a front-end designer conceives of logically for a hierarchy will differ from how an optimized physical… Read More


Requirements Management and IP Management Working Together

Requirements Management and IP Management Working Together
by Daniel Payne on 09-12-2016 at 12:00 pm

I first heard about requirements management back in 1995 while marketing a graphic HDL entry tool for an EDA vendor, and it sounded like a very useful automation approach, however our team quickly discovered that there were too many different vendors for requirements management, so there could be no simple way to integrate with… Read More


Power-Aware Debug to Find Low-Power Simulation Bugs

Power-Aware Debug to Find Low-Power Simulation Bugs
by Daniel Payne on 09-09-2016 at 12:00 pm

When I worked at Intel designing custom chips my management would often ask me, “Will first silicon work?” My typical response was, “Yes, but only for the functions that we could afford to simulate before tape-out.” This snarky response would always cause a look of alarm, quickly followed by a second … Read More


Five Things To See at DVCon India 2016

Five Things To See at DVCon India 2016
by Daniel Payne on 09-02-2016 at 12:00 pm

DVCon is an annual Design and Verification Conference that started out in Silicon Valley, then expanded by adding India as a new location. Our semiconductor design and verification world is global in stature, so if you’re living in the region then consider registering for this event held Thursday and Friday, September Read More


Three Steps for Custom IC Design Migration and Optimization

Three Steps for Custom IC Design Migration and Optimization
by Daniel Payne on 08-31-2016 at 7:00 am

Popular companies designing smart phones, CPUs, GPUs and Memory components all employ teams of custom IC designers to create the highest performance chips that are as small as possible, and at the lowest costs. How do they go about doing custom IC design migration and optimization when moving from one process node to another one?… Read More


Low Frequency Noise Challenges IC Designs

Low Frequency Noise Challenges IC Designs
by Daniel Payne on 08-28-2016 at 7:00 am

AMS and RF IC designers have known for years that their circuits are sensitive to noise, because if you amplify noise on an input source to an amplifier circuit then your chip can start to produce wrong answers. Even digital SoC designers need to start taking notice because every SoC is filled with SRAM IP blocks, and at each shrinking… Read More


Did My FPGA Just Fail?

Did My FPGA Just Fail?
by Daniel Payne on 08-22-2016 at 12:00 pm

Designing DRAMs at Intel back in the 1970s I first learned about Soft Errors and the curious effect of higher failure rates of DRAM chips in Denver, Colorado with a higher altitude than Aloha, OR. With the rapid growth of FPGA-based designs in 2016, we are still asking the same questions about the reliability of our chips used for safety-critical… Read More


Are Your Transistor Models Good Enough?

Are Your Transistor Models Good Enough?
by Daniel Payne on 08-16-2016 at 12:00 pm

SoC designers can now capture their design ideas with high-level languages like C and SystemC, then synthesize those abstractions down into RTL code or gates, however in the end the physical IC is implemented using cell libraries made up of transistors. Circuit designers use simulation tools like SPICE on these transistor-level… Read More